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# NAME

Number::RangeTracker - Keep track of numerical ranges quickly

# VERSION

Version 0.6.0

# SYNOPSIS

Create and modify ranges (three range syntaxes shown):

   my $range = Number::RangeTracker->new;
   $range->add( [ 1, 10 ], '11..20' );
   $range->remove( 6, 15 );

Output ranges, their complement, or integers within ranges
(differences between scalar and list contexts shown):

   $range->output;
     # Scalar context: '1..5,16..20'
     # List context:   ( 1 => 5, 16 => 20 )

   $range->complement;
     # Scalar context: '-inf..0,6..15,21..+inf'
     # List context:   ( -inf => 0, 6 => 15, 21 => +inf )

   $range->integers;
     # Scalar context: '1,2,3,4,5,16,17,18,19,20'
     # List context:   ( 1, 2, 3, 4, 5, 16, 17, 18, 19, 20 )

Examine range characteristics:

   $range->length;              # 8
   $range->size;                # 10

   $range->is_in_range(100);    # 0
   $range->is_in_range(18);     # 1, 16, 20

# DESCRIPTION

An instance of the Number::RangeTracker class is used to keep track of
a set of numerical ranges. Ranges can be added to and removed from
this collection of ranges. Overlapping ranges are collapsed to form a
single, longer range. Ranges can be manipulated, examined, and output
in a variety of ways.

While some other modules associate values with a range of keys (see
["SEE ALSO"](#see-also)), the objective of Number::RangeTracker is to quickly and
easily monitor the integers on a number line that are covered by at
least one range. Number::RangeTracker performs significantly faster
than other modules that have similar functions (see ["SEE ALSO"](#see-also)).

- new

   Initializes a new Number::RangeTracker object.

- add( START, END )

   Add one or more ranges. This can be used multiple times to add ranges
   to the object. Ranges can be added in several ways. The following are
   equivalent.

       $range->add( [ 1, 10 ], [ 16, 20 ] );
       $range->add( 1, 10, 16, 20 );
       $range->add( '1..10', '16..20' );

- remove( START, END )

   Remove one or more ranges from the current set of ranges. This can be
   used multiple times to remove ranges from the object. Ranges can be
   removed with the same syntax used for adding ranges.

- collapse

   When ranges are added or removed, overlapping ranges are not collapsed
   until necessary. This allows range Number::RangeTracker to be very
   fast.

   Ranges can be manually collapsed to avoid memory issues when
   working with very large amounts of ranges. In one test, a million
   overlapping ranges required ~100 MB of memory. This requirement was
   cut drastically by collapsing ranges after every 100,000th range was
   added.

   Ranges are automatically collapsed (and merged or removed where
   appropriate) (1) before ranges are added (if there are ranges still
   waiting to be removed) and (2) before each of the following methods is
   executed.

- length

   Returns the total length of all ranges combined.

- size

   Returns the total number of elements (i.e., integers) of all ranges.

- is\_in\_range( VALUE )

   Test whether a VALUE is contained within one of the ranges. Returns 0
   for a negative result. Returns a list of three numbers for a positive
   result: 1, start position of the containing range, end position of the
   containing range.

- output

   Returns all ranges sorted by their start positions. In list context,
   returns a list of all ranges sorted by start positions. This is
   suitable for populating a hash, an array, or even another range
   object. In scalar context, returns a string of ranges formatted as:
   `1..10,16..20`.

- integers

   Returns each integer contained within the ranges. In list context,
   returns a sorted list. In scalar context, returns a sorted,
   comma-delimited string of integers.

- complement( UNIVERSE\_START, UNIVERSE\_END )

   Returns the complement of a set of ranges. The output is in list
   context sorted by range start positions.

       my $original_range = Number::RangeTracker->new;
       $original_range->add( [ 11, 20 ], [ 41, 60 ], [ 91, 110 ] );

       my %complement = $original_range->complement;
       # -inf => 10,
       # 21   => 40,
       # 61   => 90,
       # 111  => +inf

   UNIVERSE\_START and UNIVERSE\_END can be used to specify a finite subset
   of the 'universe' of numbers (defaults are -/+ infinity. The
   complement ranges are bounded by these values.

       %complement = $original_range->complement( 1, 50 );
       # 1  => 10,
       # 21 => 40

   A new object with the complement of a set of ranges can be created
   quickly and easily.

       my $complement_range = Number::RangeTracker->new;
       $complement_range->add( $original_range->complement );

# SEE ALSO

- Monitor the integers covered by at least one range

   Although there is some functional overlap between this module,
   [Number::Range](https://metacpan.org/pod/Number::Range), and
   [Range::Object::Serial](https://metacpan.org/pod/Range::Object::Serial), Number::RangeTracker
   is significantly faster.

   It takes less than one second for Number::RangeTracker to add 100,000
   overlapping ranges. Over this same period of time, Number::Range and
   Range::Serial::Object are only able to add 1,000 and 300 ranges,
   respectively.

   Some tasks require even higher throughput. When adding 1 million
   overlapping ranges, Number::Range took >250 times as long as
   Number::RangeTracker (35 min 31 sec vs. 8 sec). Range::Object::Serial
   slows exponentially as ranges are added and, therefore, it was not
   feasible to test this many ranges.

   

- Ranges with strandedness (like double-stranded DNA or mile posts
on a two-way road)

   [Bio::Range](https://metacpan.org/pod/Bio::Range)

- Compare numbers in an imprecision-tolerant manner

   [Number::Tolerant](https://metacpan.org/pod/Number::Tolerant)

- Named ranges

   [Tie::RangeHash](https://metacpan.org/pod/Tie::RangeHash),
   [Array::IntSpan](https://metacpan.org/pod/Array::IntSpan)

# SOURCE AVAILABILITY

The source code is on Github:
[https://github.com/mfcovington/Number-RangeTracker](https://github.com/mfcovington/Number-RangeTracker)

# AUTHOR

Michael F. Covington, <[email protected]>

# BUGS

Please report any bugs or feature requests at
[https://github.com/mfcovington/Number-RangeTracker/issues](https://github.com/mfcovington/Number-RangeTracker/issues).

# INSTALLATION

To install this module from GitHub using cpanm:

   cpanm [email protected]:mfcovington/Number-RangeTracker.git

Alternatively, download and run the following commands:

   perl Build.PL
   ./Build
   ./Build test
   ./Build install

# SUPPORT AND DOCUMENTATION

You can find documentation for this module with the perldoc command.

   perldoc Number::RangeTracker

# LICENSE AND COPYRIGHT

Copyright 2014 Michael F. Covington.

This program is free software; you can redistribute it and/or modify it
under the terms of the the Artistic License (2.0). You may obtain a
copy of the full license at:

[http://www.perlfoundation.org/artistic\_license\_2\_0](http://www.perlfoundation.org/artistic_license_2_0)

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